If the guppies survive, I would just put them in a regular tank, like any other fish. I'm not allowed to breed bettas because, like I said before, without paypal, i can't get quality bettas to breed and I wouldn't want to end up with bettas from the perstore to breed. There won't be enough room in the house for hundreds of jars and in the basement, it is not only cold but there are mice and it is quite damp. I've never rescued fish in such a state before so this is almost an experiment. If it goes well, I may continue. If it fails, I will move on and follow your train of thought and breed bettas.